You can also increase the efficiency by putting 3 walls around it or even partial walls.
It will help with directing the flow more smoothly.
It does suck that there really isn't a "one size fits all" answer to ventilation setups but everyones situation is different and we all have to make it up as we go along.
You only have to get it right once, but you do have to get it right that one time.
Looks good.
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